This earwax filter is waterproof and oil-resistant, which can prolong the life of your hearing device by preventing earwax or water from being trapped inside.Mini size can fit most hearing aids for RESOUND, PHONAK, UNITRON, WIDEX, ACOSOUND, etc. (Do not fit for SIEMENS, Starkey).Features:1.Waterproof and oil-resistant filter, can prolong the life of your hearing device by preventing earwax or water from being trapped inside.2.Made of quality material, which ensures durability of long time use.3.Mini size, can fit most hearing aids for RESOUND, PHONAK, UNITRON, WIDEX, ACOSOUND, etc. (Do not fit for SIEMENS, Starkey).4.Easy to install, make sure the older or other groups at ease.5.8 Pcs / set, can meet your basic demand.Specification:Item Type: Hearing Aid AccessoriesMaterial: PlasticColor: As Pictures ShownItem Length: Approx. 4 cm / 1.6 inchItem Weight: Approx. 8 g / 0.3 ozFunction: Earwax GuardHow to use:1.Use screenchanger to take out old filter.2.Clean the edge of the horn on the hearing aid.3.Use the other end to stick a new filter.4.Install a new filter and make sure it firm.Package Include:1* Set of Earwax Filter (8 Pcs)Note:1.Please confirm the filter installed firmly, preventing it from being trapped in auditory meatus.2.Replace the earwax filter according to the circumstances after using every six months or one year.3.Use brush to clean the earwax filter frequently.